A feature of reverse circulation pneumatic down-the-hole (DTH) hammer drilling system is its ability to reduce the emission of respirable dust which is known to be harmful to drilling workers and equipment. The enhanced dust control performance of the drilling system requires better understanding and insight into the airflow behavior at the bottom of the borehole. To investigate the transportation and distribution of cuttings under various drilling parameters, and to evaluate the dust control performance, we conducted a series of simulations using computational fluid dynamics (CFD) multiphase modeling. Finite volume analysis was performed on a reverse circulation drill bit with an optimized structure reported in a previous study. The results show that increasing the input airflow rate can directly improve the dust control efficiency. The rising value in terms of cuttings feed concentration, rate of penetration (ROP), particle diameter, and specularity coefficient would decrease the dust control performance. Furthermore, the characteristics of the cutting distribution vary with the operating parameters and demonstrate the multiphase flow pattern in the RC-bit. This work may provide instructive insights into cutting transportation under various drilling parameters commonly considered in the drilling process and promote the development of dust suppression with efficient drilling operations.

反循环气动潜孔 (DTH) 锤钻系统的一个特点是它能够减少已知对钻井工人和设备有害的可吸入粉尘的排放。钻井系统增强的粉尘控制性能需要更好地理解和洞察钻孔底部的气流行为。为了研究不同钻井参数下岩屑的运输和分布，并评估粉尘控制性能，我们使用计算流体动力学 (CFD) 多相建模进行了一系列模拟。在先前研究中报告的具有优化结构的反循环钻头上进行了有限体积分析。结果表明，提高输入风量可以直接提高除尘效率。岩屑进料浓度、渗透率 (ROP)、粒径和镜面反射系数的值升高会降低粉尘控制性能。此外，切削分布的特征随操作参数的变化而变化，并展示了 RC 钻头中的多相流模式。这项工作可以为钻井过程中普遍考虑的各种钻井参数下的切割运输提供指导性见解，并通过有效的钻井作业促进粉尘抑制的发展。切削分布的特征随操作参数而变化，并展示了RC钻头中的多相流动模式。这项工作可以为钻井过程中普遍考虑的各种钻井参数下的切割运输提供指导性见解，并通过有效的钻井作业促进粉尘抑制的发展。切削分布的特征随操作参数而变化，并展示了RC钻头中的多相流动模式。这项工作可以为钻井过程中普遍考虑的各种钻井参数下的切割运输提供指导性见解，并通过有效的钻井作业促进粉尘抑制的发展。